[evla-sw-discuss] Keeping track of spectral windows at the EVLA: SDM vs. BDF

[Barry Clark]

I'm confused.  In eight bit mode, there are only the AC and BD baseband
pairs.  Of course, they may be replicated ad libidum within the station
boards, but there are only those two pairs, unless we talk about single
basebands, which I'd rather forget about, even for RSRO.

David Harland wrote:
> Michael Rupen wrote:
>> Hello all --
>>
>> we've gone a full round on the enumerations and on the ordering of SpW,
>> so here's the final decision (for now, anyhow :) --
>>
>>
>> 1- On the enumeration front let's stick with what Sonja has just
>> put in:
>>
>> A1C1_3BIT A2C2_3BIT AC_8BIT B1D1_3BIT B2D2_3BIT BD_8BIT
>>
>> I believe that order is alphabetic and deterministic.
>> - Note that as Barry says we will never have, e.g., both A1C1 and AC,
>> so the relative ordering of AC and A1C1 doesn't really matter.
> 
> I'm preparing to implement this and want to point out something in case 
> it was overlooked. This is not really an issue for OSRO, but i'd like to 
> code for post-osro now if possible.
> 
> The A0/C0 (or A/C, 8-bit) IF pair can lead to TWO widar baseband pairs: 
> pair 0/2 and pair 1/3. Each of these pairs would then have the same 
> "AC_8BIT" value for the new swbbName attribute.
> 
> Is this OK?
> 
> If so, does it mean the creation of the new swIndex attribute of the 
> subband needs to be created by sorting subbands across these two BBPs 
> (0/2 & 1/3)?
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